Roger
One more aspect ..
I predict quake with +or - 0.3 mag window. Each prediction should be evaluated with its own odds.ie if predicted 6.5 the odds to be considered should be only pertainng to quakes between 6.2 and 6.8.
Thus each prediction odds are different.Hence 6+ quake odds can not be applied to all predictions. How these all prediction can be evaluated with single odd is not known.
Amit